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 * $HeadURL$
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 * $Date$
 * 
 * ====================================================================
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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package com.app.mvc.http.ext;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.HttpClientError;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;

import javax.net.SocketFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 * <p>
 * EasySSLProtocolSocketFactory can be used to creats SSL {@link Socket}s
 * that accept self-signed certificates.
 * </p>
 * <p>
 * This socket factory SHOULD NOT be used for productive systems
 * due to security reasons, unless it is a concious decision and
 * you are perfectly aware of security implications of accepting
 * self-signed certificates
 * </p>
 * <p/>
 * <p>
 * Example of using custom protocol socket factory for a specific host:
 * <pre>
 *     Protocol easyhttps = new Protocol("https", new EasySSLProtocolSocketFactory(), 443);
 *
 *     URI uri = new URI("https://localhost/", true);
 *     // use relative url only
 *     GetMethod httpget = new GetMethod(uri.getPathQuery());
 *     HostConfiguration hc = new HostConfiguration();
 *     hc.setHost(uri.getHost(), uri.getPort(), easyhttps);
 *     HttpClient client = new HttpClient();
 *     client.executeMethod(hc, httpget);
 *     </pre>
 * </p>
 * <p>
 * Example of using custom protocol socket factory per default instead of the standard one:
 * <pre>
 *     Protocol easyhttps = new Protocol("https", new EasySSLProtocolSocketFactory(), 443);
 *     Protocol.registerProtocol("https", easyhttps);
 *
 *     HttpClient client = new HttpClient();
 *     GetMethod httpget = new GetMethod("https://localhost/");
 *     client.executeMethod(httpget);
 *     </pre>
 * </p>
 *
 * @author <a href="mailto:oleg -at- ural.ru">Oleg Kalnichevski</a>
 *         <p/>
 *         <p>
 *         DISCLAIMER: HttpClient developers DO NOT actively support this component.
 *         The component is provided as a reference material, which may be inappropriate
 *         for use without additional customization.
 *         </p>
 */
@Slf4j
public class EasySSLProtocolSocketFactory implements SecureProtocolSocketFactory {

    private SSLContext sslcontext = null;

    /**
     * Constructor for EasySSLProtocolSocketFactory.
     */
    public EasySSLProtocolSocketFactory() {
        super();
    }

    private static SSLContext createEasySSLContext() {
        try {
            SSLContext context = SSLContext.getInstance("SSL");
            context.init(null, new TrustManager[] { new X509TrustManager() {

                @Override
                public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

                }

                @Override
                public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

                }

                @Override
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
            } }, null);
            return context;
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new HttpClientError(e.toString());
        }
    }

    private SSLContext getSSLContext() {
        if (this.sslcontext == null) {
            this.sslcontext = createEasySSLContext();
        }
        return this.sslcontext;
    }

    /**
     * @see org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory#createSocket(String, int, InetAddress, int)
     */
    public Socket createSocket(String host, int port, InetAddress clientHost, int clientPort) throws IOException, UnknownHostException {

        return getSSLContext().getSocketFactory().createSocket(host, port, clientHost, clientPort);
    }

    /**
     * Attempts to get a new socket connection to the given host within the given time limit.
     * <p>
     * To circumvent the limitations of older JREs that do not support connect timeout a
     * controller thread is executed. The controller thread attempts to create a new socket
     * within the given limit of time. If socket constructor does not return until the
     * timeout expires, the controller terminates and throws an {@link org.apache.commons.httpclient.ConnectTimeoutException}
     * </p>
     *
     * @param host         the host name/IP
     * @param port         the port on the host
     * @param localAddress the local host name/IP to bind the socket to
     * @param localPort    the port on the local machine
     * @param params       {@link org.apache.commons.httpclient.params.HttpConnectionParams Http connection parameters}
     * @return Socket a new socket
     * @throws IOException          if an I/O error occurs while creating the socket
     * @throws UnknownHostException if the IP address of the host cannot be
     *                              determined
     */
    public Socket createSocket(final String host, final int port, final InetAddress localAddress, final int localPort, final HttpConnectionParams params)
            throws IOException, UnknownHostException, ConnectTimeoutException {
        if (params == null) {
            throw new IllegalArgumentException("Parameters may not be null");
        }
        int timeout = params.getConnectionTimeout();
        SocketFactory socketfactory = getSSLContext().getSocketFactory();
        if (timeout == 0) {
            return socketfactory.createSocket(host, port, localAddress, localPort);
        } else {
            Socket socket = socketfactory.createSocket();
            SocketAddress localaddr = new InetSocketAddress(localAddress, localPort);
            SocketAddress remoteaddr = new InetSocketAddress(host, port);
            socket.bind(localaddr);
            socket.connect(remoteaddr, timeout);
            return socket;
        }
    }

    /**
     * @see org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory#createSocket(String, int)
     */
    public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(host, port);
    }

    /**
     * @see org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory#createSocket(Socket, String, int, boolean)
     */
    public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException, UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(socket, host, port, autoClose);
    }

    public boolean equals(Object obj) {
        return ((obj != null) && obj.getClass().equals(EasySSLProtocolSocketFactory.class));
    }

    public int hashCode() {
        return EasySSLProtocolSocketFactory.class.hashCode();
    }

}
